How to compare two CSV columns without uploading your data
A step-by-step workflow for checking spreadsheet exports, identifying values shared by two columns, and reviewing differences safely in your browser.
Read the guide →Shortcuts are useful, but a reliable workflow matters more. These original guides explain how to prepare, compare, and review everyday lists without sending them to a server.
A list comparison is most useful when you know the decision it should support: which records are missing, which values overlap, or which repeats should be removed. The guides below use small examples and explain the checks that prevent a fast comparison from turning into a misleading one.
A step-by-step workflow for checking spreadsheet exports, identifying values shared by two columns, and reviewing differences safely in your browser.
Read the guide →A practical way to normalize a messy list, decide what counts as a duplicate, and preserve an auditable original before you clean it.
Read the guide →